Secondary alkenols prepared from aluminum compounds

ABSTRACT

Nonionic compounds in which an aluminum atom is part of an olefinically unsaturated ring system are prepared by causing interaction among aluminum, a conjugated diene and a hydrocarbon aluminum hydride in the presence of a suitable Lewis base such as 1,4-dioxane or N-methyl pyrrolidine. The resulting cyclic organoaluminum compound is useful in the synthesis of olefins and branched chain alkenols. Thus by subjecting the cyclic organoaluminum compound to hydrolysis, one or more olefins may be produced. To prepare branched chain alkenols, the cyclic organoaluminum compound is reacted with a cleavable cycloparaffinic monether having a 3, 4 or 5 membered ring. Thereupon the reaction mixture is subjected to hydrolysis. The following novel compounds were prepared by this procedure: 1-CHLOROMETHYL-3,4-DIMETHYL-4-PENTEN-1-OL 1-CHLOROMETHYL-3,3-DIMETHYL-4-PENTEN-1-0L 2,2-BIS(CHLOROMETHYL)4,5-DIMETHYL-5-HEXEN-1-OL 2,2-BIS(CHLOROMETHYL)-4,4-DIMETHYL-5-HEXEN-1-OL 1,5,5-TRIMETHYL-6-HEPTEN-1-OL 1,5,6-TRIMETHYL-6-HEPTEN-1-OL 4,5,6-TRIMETHYL-6-HEPTEN-1-OL 2,2,3-TRIMETHYL-5,5-BIS(CHLOROMETHYL)TETRAHYDROPYRAN

Tlnited States Patent [191 lBrendel et a1.

[ June 28, 1974 1 1 SECONDARY ALKENOLS PREPARED FROM ALUMINUM COMPOUNDS [75] Inventors: Gottfried J. Brendel; Lawrence H.

Shepherd, Jr., both of Baton Rouge, La.

[73] Assignec: Ethyl Corporation, Richmond, Va.

[22] Filed: May 25, 1972 {21] Appl. No.: 257,049

Related U.S. Application Data [62] Division of Ser. No. 78,213, Oct. 5, 1970, Pat. No. 3,692,847, which is a division of Ser. No. 771,651, Oct. 29, 1968, Pat. No. 3,631,065.

[52] US. Cl 260/632 R, 252/106, 252/364,

252/D1G. 13, 260/340.6, 260/676 R,

[51] Int. Cl C07c 33/02 [58] Field of Search 260/632 R [56] References Cited UNITED STATES PATENTS 2,394,848 2/1946 Doumani 260/632 R 3,028,431 4/1962 Webb 260/632 R 3,285,950 11/1966 Weber 260/632 R 3,631,179 12/1971 Urry 260/632 R Primary Examiner.loseph E. Evans Attorney, Agent, or FirmDonald L. Johnson; John F.

Sieberth ABSTRACT Nonionic compounds in which an aluminum atom is part of an olefinically unsaturated ring system are prepared by causing interaction among aluminum, a conjugated diene and a hydrocarbon aluminum hydride in the presence of a suitable Lewis base such as 1,4- dioxane or N-methyl pyrrolidine. The resulting cyclic organo-alurninum compound is useful in the synthesis of olefins and branched chain alkenols. Thus by subjecting the cyclic organo-aluminum compound to hydrolysis, one or more olefins may be produced. To prepare branched chain alkenols, the cyclic organoaluminum compound is reacted with a cleavable cycloparaffinic monether having a 3, 4 or 5 membered ring. Thereupon the reaction mixture is subjected to hydrolysis. The following novel compounds were prepared by this procedure:

1-chloromethyl-3 ,4-dimethyl-4-penten- 1 -ol l-chloromethyl-3,3-dimethyl-4-penten- 1 -O1 2,2-bis(chloromethyl )4,5-dimethyl-5-hexen- 1 -ol 2,2-bis(chloromethyl )-4,4-dimethyl-5-hexen- 1 -ol 1 ,5 ,5-trimethyl-6-hepten-1-01 1,5 ,6-trimethyl-6-hepten- 1 -ol 4,5 ,6-trimethyl-6-hepten- 1 -ol 2,2,3-trimethyl-5,5-bis(chloromethyl)tetrahydropyran 3 Claims, No Drawings SECONDARY ALKENOLS- PREPARED FROM ALUMINUM COMPOUNDS This is a division of application Ser. No. 78,213, filed Oct. 5, 1970, now US. Pat. No. 5,692,547, which in turn is a division of'application Ser. No. 771,651, filed Oct. 29, 1968, now U.S. Pat. No. 3,631,065.

This invention relates to cyclic organoaluminum compounds, their synthesis and their use in the synthesis of olefins and branched chain alkenols. More particularly, this invention relates to compounds in which an aluminum atom is part of an olefinically unsaturated rmg system.

Lehmkuhl, Angew, Chem. International Edition 5, 663 (1966), indicates that reaction of butadiene with alkali metal in an ethes in the presence of an amount of trirnethylaluminum-ether adduct equivalent to the metal causes the formation of the complex:

HnC

11+ (CHmAl 4 where M is lithium or sodium. This adduct is insoluble in aliphatic hydrocarbons and benzene. lt decomposes above 150C. without melting.

ln copending application Ser. No. 748,613 filed July 30, 1968 one of us (GJB) now U.S, Pat. No. 3,493,623, has shown that aluminum-containing reaction products are prepared by effecting reaction at an elevated temperature in a system composed of aluminum, a cycloparaffinic monoether, a hydrocarbyl aluminum hydride and a diene. This is a complex condensation reaction which involves, in part, cleavage of the ring of the ether reactant. Hydrolysis of this aluminum-containing reaction product results in the liberation of branched chain alkenola.

The present invention involves, inter alia, the discovery that interaction may be caused among aluminum, a conjugated diene and a hydrocarbon aluminum hydride in the presence of certain Lewis bases to produce novel cyclic aluminum compounds which, unlike the adducts of Lehmkuhl, are nonionic. in conducting this reaction it is important to employ a Lewis base capable of complexing with the organoaluminum product without undergoing excessive cleavage. For best results the reaction is conducted in such Lewis bases as tertiary amines, dialkyl ethers, cycloparaffinic monoethers having a six membered ring, or cycloparaffinic diethers having a five or six membered ring.

The cyclic organoaluminum compounds produced in this process possess an aluminacycloalkene moiety. For example when 2,3-dimethyl butadiene is the diene employed in the process, the nonionic organoaluminum compound produced will contain the 3,4-dimethylaluminacyclopent-3-ene moiety;

CH2 CH:

Al i

In other words two-thirds of a chemical equivalent of aluminum'is directly involved in forming an olefinically unsaturated ring system.

The available experimental evidence tends strongly to indicate that the cyclic aluminum compounds of this invention exist in different molecular forms. By way of illustration, when the diene reactant in butadiene or butadiene substituted in the two position or in the two and three positions, the principal product produced is characterized by the formula:

wherein R is a hydrocarbon group having up to about 18 carbon atoms; R is a hydrogen, alkyl or alkenyl group; and R" is a hydrogen or alkyl group.

In this preferred class of Compounds R corresponds to the hydrocarbon group initially present in the hydrocarbon aluminum hydride (most preferably a lower alkyl group).

On the other hand some of the product of the reaction appears to involve displacement of this. R group and coupling of two aluminacycloalkene moieties via an alkenylene group. In this case the product (when employing butadiene or butadiene substituted on either or both of the internal carbon atoms) is characterized by the formula:

wherein R is a hydrogen, alkyl or alkenyl group; and R is a hydrogen or alkyl group.

There is a marked tendency for the cyclic aluminum compounds of this invention to form complexes with Lewis bases such as tertiary amines, dialkyl ethers, cycloparaffmic monoethers having a six membered ring (e.g., tetrahydropyran) and cycloparaffinic diethers having a five or six membered ring (e.g., 1,4-dioxane). These complexes constitute preferred embodiments of this invention. Inasmuch as the cyclic aluminum compounds are nonionic, they are soluble in conventional aliphatic and aromatic hydrocarbon solvents, such as benzene.

The cyclic aluminum compounds of this invention may be readily hydrolyzed with water or with aqueous mineral acids or bases whereby olefins are produced. These olefins have the skeletal configurations of the hydrocarbon portion of the aluminacycloalkene moiety present in the nonionic organoaluminum compound being hydrolyzed. However the position of the double bond in the liberated olefin is dependent to some extent upon the hydrolysis conditions employed. It is possible, for example, to produce either alpha-olefins or olefins containing an internal double bond.

The cyclic aluminum compounds of this invention readily cleave cycloparaffinic monoethers having three or four membered rings. The resulting organoaluminum product on hydrolysis yields a branched chain alkenol whose carbon content corresponds to the sum of the carbon atoms of the diene used in forming the initial cyclic aluminum compound and of the cycloparaffinic monoether reacted therewith.

When the cyclic aluminum compounds of this invention are in admixture with cycloparaffinic monoethers having a five membered ring (e.g., tetrahydrofuran) there is also a marked tendency, especially at temperatures of about 150C. and above, for this same type of cleavage-condensation reaction to occur. Hydrolysis of the resulting aluminum-containing intermediate results in the formation of a branched chain alkenol having more carbon atoms than the diene from which the cyclic aluminum compound had been formed, the increase in carbon atoms corresponding to the number of carbon atoms present in the cyclic monoether. However it is possible to maintain the nonionic cyclic aluminum compounds of this invention in contact with tetrahydrofuran and ring alkylated derivatives thereof without excessive ring cleavage occuring provided that the temperature is kept low enough.

In order to still further appreciate the practice and advantages of this invention reference should be had to the following illustrative examples.

EXAMPLE I l-lsobutyl-3 -methyl-aluminacyclopent-3-ene etherate Activated aluminum metal (367 m moles), diethyl ether l.23 moles), isoprene (150 m. moles) and diisobutyl aluminum hydride (24 m moles) were brought together and heated at l45-l55C. for 3 hours. The unreacted aluminum metal was recovered by filtration. lt was thereby established that 62 m moles of the aluminum metal had participated in the reaction. Hydrolysis of a portion of the liquid reaction mixture with water followed by aqueous HCl at to 25C. resulted in the liberation of isobutane, isopentene and a small quantity of two unsaturated C, hydrocarbons. Analysis of the isolated C hydrocarbons indicated they had a molecular weight of 98 which corresponds to C H This indicates that some portion of the diethyl ether was cleaved during the reaction and that the cleaved ether interacted with some of the isoprene or a derivative thereof thereby producing the C hydrocarbon isomers. Deuterolysis of the liquid reaction mixture liberated isopentene, 90 percent of which was dideuterated. Material balance studies indicated that at least 75 percent of the aluminum which had reacted was present in the form of the 3-methyl-aluminacyclopent-3-ene moiety. In other words the diethyl ether was not excessively cleaved either during the reaction or by the nonionic cyclic organoaluminum compound produced.

diethyl Thus this reaction resulted in the formation, inter alia, of the compound:

u h H l sobutyl W In a control experiment conducted under conditions similar to those described above, it was found that interaction between diisobutyl aluminum hydride and isoprene in diethyl ether (in the absence of aluminum metal) did not produce any compounds which give rise to appreciable amounts of dideuterated isopentenes on deuterolysis. Most of the isopentenes on deuterolysis of the reaction mixture were monodeuterated.

EXAMPLE ll l-lsobutyl-3-methyl-aluminacyclopent-3-ene dropyranate The reaction of aluminum powder (365 m moles), isoprene (l50 m moles), and diisobutyl aluminum hydride (24 m moles) in tetrahydropyran (1.23 moles) for 2 hours at l45-l 50C. resulted in the consumption of 35 m moles of the aluminum powder. Hydrolysis of tetrahya portion of the reaction mixture revealed that 61 m tikl isobutyl EXAMPLE [I] l-lsobutyl-3-methyl-aluminacyclopent-3-ene methylpyrrolidinate N-methylpyrrolidine 1.23 moles), aluminum metal (361 m moles) isoprene m moles) and diisobutyl aluminum hydride (23 m moles) were allowed to react at 150C. for 2 hours. This resulted in 36 m moles of the aluminum metal being solubilized. Deuterolysis of the reaction mixture with D SO /D O liberated, in addition to monodeuterated isopentane, 61 m moles of isopentenes, 83 percent of which were dideuterated. Consequently all of the aluminum which participated in the reaction was converted to the 3-methylaluminacyclopent-3-ene moiety. Little or no cleavage of the cyclic amine occurred. Accordingly this reaction resulted in the formation in good yield of the compound:

lit 1 lBOblltyl EXAMPLE lV l-lsobutyl-3-methyl-aluminacyclopent-3-ene dioxanate Reaction of aluminum metal (365 m moles), isoprene 150 m moles), diisobutyl aluminum hydride (31 m moles) in 1,4-dioxane (l.23 moles) at 150C. for 2 hours resulted in solubilizing 71 m moles of aluminum metal. Deuterolysis of the product liberated 117 m moles of isopentenes, 107 m moles of which was dideuterated. Consequently almost all of the aluminum which entered into the reaction was converted into the 3-methyl-aluminacyclopent-3-ene moiety. Very little, if any, cleavage of the dioxane solvent occurred.

A portion of the liquid reaction product was concentrated by vacuum removal of some of the dioxane solvent. The nuclear magnetic resonance spectrum of the concentrated sample showed the presence of isobutyl aluminum groups. This was further corroborative evidence that the reaction resulted principally in the formation of the compound:

A1 isobutyl l-lsobutyl-3-ethyl-aluminacyclopent-3-ene dioxanate Powdered aluminum metal (365m moles), 2-ethylbutadiene 150 m moles), and diisobutyl aluminum hydride (30 m moles) were caused to react in l,4-dioxane (1,23 moles) at I45-l50C. for 2 hours. A portion of the resulting liquid reaction product was subjected to hydrolysis using water followed by aqueous HCl at 25C. This resulted in the liberation of 3-methylpentene-l, 2-ethylbutene-l and trans-3-methylpentene-2. The indentities of these C6 hydrocarbons were established by comparing the VPC retention times and nuclear magnetic resonance spectra of these compounds with those obtained on authentic samples of the known compounds. No cia-methylpentene-2 was detected in the liberated mixture of C6 hydrocarbons. Another portion ofthe liquid reaction-product was diluted in the dimethyl ether of diethylene glycol and the temperature of the system was reduced to -80C. Thereupon deuterolysis was effected using NaOD/D O while allowing the system to reach room temperature. Analysis of the liberated C olefins showed that the mixture was composed of 50 percent trans-3-methyl-pentene-2, 44 percent Z-ethylbutene-l, and 6 percent 3-methylpentene-l. The 'trans-3-methylpentene-3 isomer was separated from the other isomers and isolated using preparative VPC methods. Mass spectrographic analysis showed this compound to be 95 percent dideuterated. The nuclear magnetic resonance spectrum of the purified dideuterated trans-3-methylpentene-2 showed that one deuterium atom was located in each of the cismethyl groups:

Gail /E C- C\ 041D CHID Consequently the original reaction product contained the 3-ethyl-aluminacyclopent-3-ene moiety as the compound:

isobutyl Hydrolysis or deuterolysis of other portions of the reaction product under differing conditions showed that it was possible to alter the distribution of the C olefins liberated. For example hydrolysis using dilute aqueous HCl at O5C. yielded' 3 percent trans-3-methylpentene-2, 83 percent 2-ethylbutene-l, and 14 percent 3-methylpentene-1. On the other hand, when deuterolysis was effected at 0C, using NaOD/D O the distribution of the deuterated isomers was 12 percent trans-3-methylpentene-2, 77 percent 2-ethylbutene-l and 11 percent 3-methylpentene-l.

EXAMPLE VI l-lsobutyl-aluminacyclopent-3-ene dioxanate When 274 m moles of butadiene, 365 m moles aluminum metal, 1.23 moles 1,4-dioxane and 31 m moles diisobutyl aluminum hydride were heated for six hours at C., a solid reaction product was obtained on cooling to room temperature. Deuterolysis of a portion of the reaction mixture liberated butene-l. A calculation indicated that hydrolysis of the entire reaction product would have liberated 202 m moles of butene which is equivalent to 74 percent of the butadiene initially added. Mass spectrographic analysis showed the butene to be dideuterated to the extent of 97 percent indicating a good conversion of the butadiene to the aluminacyclopent-B-ene moiety as, the compound:

In like manner, reaction among powdered aluminum, myrcene and diisobutyl aluminum hydride in excess l,4-dioxane solvent at 150C. results in the formation of l-isobutyl-3(4-methyl-3-pentenyl)- aluminacyclopent-3-ene:

i111 isobutyl Similarly, reaction at 150C. in 1,4-dioxane among aluminum, isoprene, and diethylaluminum hydride produces 1-ethyl-3-methyl-aluminacyclopent-3-ene:

Substitution of diphenylaluminum hydride for the diethylaluminum hydride gives rise to the production of the corresponding l-phenyl compound.

EXAMPLE Vll Reaction of l-isobutyl-3-methyl-aluminacyclopent- 3-ene with tetrahydrofuran A system composed of activated aluminum powder (365 m moles), isoprene (150 m moles), diisobutyl aluminum hydride (31 m moles) and diethyl ether (1.23 moles) was heated to 145-150C. for 2 hours. The resulting diethyl ether complex of l-isobutyl-3-methylaluminacyclopent-3-ene was separated from the unreacted aluminum metal. Excess diethyl ether was removed by distillation and the residue dissolved in tetrahydrofuran. The resulting tetrahydrofuran solution of the cyclic aluminum compound was heated at 150C. for 2 hours. The reaction mixture was then subjected to hydrolysis and this resulted in the liberation of the C alkenols 5,6-dimethyl-6-hepten-l-ol and 5,5-dimethyl-6-hepten-l-o1 in a ratio of approximately 80:20, respectively. Consequently under proper reaction conditions the cyclic aluminum compounds of this invention will cleave tetrahydrofuran and make possible the preparation of branched chain alkenols (cf. Example of Ser. No. 748,613).

EXAMPLE Vlll Reaction of 1-isobutyl-3-methyl-aluminacyclopent- 3-ene with epichlorohydrin 1-lsobutyl-3-methyl-aluminacyclopent-3-ene was prepared by reacting activated aluminum powder with isoprene and diisobutyl aluminum hydride in excess 1,4-dioxane at 150C. for 2 hours. The unreacted aluminum metal was removed by filtration of the liquid reaction mixture. To 43 m moles of the 1-isobutyl-3- methyl-aluminacyclopent-3-ene contained in 30 milliliters 1,4-dioxane was slowly added 6 milliliters (78 m moles) of epichlorohydrin. An exothermic reaction occurred. Then the reaction mixture was diluted with diethyl ether and the mixture hydrolyzed with dilute aqueous HCl Excess reaction solvent was removed under vacuum and the product was distilled. The main fraction boiled at 65-66C. at 1.8 mm Hg. Analysis of this fraction by nuclear magnetic resonance and vapor phase chromatography showed this product to be a mixture of 1-chloromethyl-3,4-dimethyl-4-penten-l-ol and 1-chloromethyl-3,3-dimethyl-4-penten-I-ol, the former isomer predominating by about 9:1.

EXAMPLE 1X Reaction of 1-isobutyl-3-methyl-aluminacyclopent- 3-ene with bis(chloromethyl)-oxetane Another portion of the dioxane solution of 1- isobutyl-3-methyl-aluminacyclopent-3-ene of Example V11] (21 m moles) was reacted with 4.1 grams (26.5 m moles) of bis(chloromethyl)-oxetane for 3 hours at 150C. After hydrolysis of the reaction product, distillation resulted in the isolation of 4.8 grams of a liquid boiling over a wide range, 60C. at 1.5 mm Hg to 134C. at 7 mm Hg. Redistillation resulted in the isolation at 128-144C. and 9 mm Hg of 2,2- bis( chloromethyl)-4,5-dimethyl-5-hexen- 1 -ol, 2,2 ,3- trimethyl-S,5-bis(chloromethyl)tetrahydropyran and 2,2-bis(chloromethyl )-4,4-dimethyl-5-hexen- 1 -ol.

EXAMPLE X Reaction of l-isobutyl-3-methyl-aluminacyclopent- 3-ene with 2-methyl-tetrahydrofuran A dioxane solution of 1-isobutyl-3-methy1- aluminacyclopent-3-ene was reacted with an excess of Z-methyI-tetrahydrofuran for 4 hours at C. After hydrolysis of the reaction product, it was found to contain l,5,5-trimethyl-6-hepten-l-ol (i.e., 6,6-dimethyl-7- octen-Z-ol 1,5,6-trimethyl-6-hepten-l-ol i.e., 6,7-dimethyl-7-octen-2-ol), l,5,6-trimethyl-5-heptenl-ol (i.e., 6,7-dimethyl-6-octen-2-ol) and 4,5,6-

trimethyl-6-hepten-1-ol. The relative amounts of these compounds as produced were approximately 37%: 49%: 3%: l 1%. respectively. The S-heptene compound evidently resulted from isomerization of the corre sponding 6-heptene compound during work up.

lt will be seen from the foregoing examples that the present invention may be successfully applied to a wide variety of suitable reactants. Thus the diene reactant, which preferably is a conjugated diene hydrocarbon, has 4 to about 18 carbon atoms in the molecule, and is exemplified by such substances as butadiene, isoprene, 2,3-dimethyl-butadiene, 2-ethyl butadiene, myrcene, 1,4-dimethyl butadiene, 1,4-diphenyl butadiene, 2- phenyl butadiene, alpha-phellandrene, and the like. Also the diene may be substituted by innocuous radicals as in the case of chloroprene and 2,3- dichlorobutadiene. Dienes wherein the double bonds are in the terminal positions are usually most suitable.

The hydrocarbon aluminum hydride reactant used in the process may be a dihydrocarbyl aluminum hydride (R AlH) in which the R groups are hydrocarbyl groups (alkyl, aryl, cycloalkyl, alkenyl, aralkyl, alkaryl, etc.).

Thus use may be made of such compounds as dimethylauminum hydride, diethylaluminum hydride, dipropylaluminum hydride, dibutylaluminum hydride, diisobutylaluminum hydride, dioctylaluminum hydride, dioctadecylaluminum hydride, diphenylaluminum hydride, ditolylaluminum hydride, dicumenylaluminum hydride, dicyclohexylaluminum hydride, dimethylcyclohexyl aluminum hydride, diallylaluminum hydride, dibenzylaluminum hydride, diphenethylaluminum hydride and the like. It is generally preferable to utilize a dialkylaluminum hydride, especially those having alkyl groups containing up to about 18 carbon atoms. The most preferred compounds are the dialkylaluminum hydrides in which each alkyl groups is a lower alkyl group and thus contains up to about 6 carbon atoms. If desired, the hydrocarbon aluminum hydride may be generated in situ by intially reacting aluminum with trihydrocarbyl aluminum (e.g., triethylaluminum) under a hydrogen atmosphere according to known technology.

The aluminum used in the process of this invention may be in the form of chips, turnings, powder, or other similar particulated states. It is definitely preferable to employ activated aluminum. Methods for producing activated aluminum are standard and well known in the art. For further details, reference may be had, for ex- 9 ample, to US. Pat. Nos. 2,885,314: 2,892,738: 2,921,876: 3,100,786 and 3,104,252.

As noted above, reactionis conducted in the presence of a Lewis base having suitable chemical stability under the reaction conditions being utilized. In most cases this Lewis base will be employed as the principal reaction solven t-i.e., the reaction will be conducted in the Lewis base selectedfor use. However if desired the reaction may be effected in a suitable inert hydrocarbon medium (e.g., paraffinic or aromatic hydrocarbon solvents such as hexane, heptane, octane, decane, cyclohexane, benzene, toluene, xylenes, and the like) provided a suitable amount of the Lewis base is also present in the reaction system. Ordinarily the system should contain at least l2 mols of Lewis base per mol of diene employed. Particularly convenient Lewis bases for use in the process are tertiary amines (e.g., trimethyl amine, dimethylethyl amine, triethyl amine, tributyl amine, triphenyl amine, tribenzyl amine, benzyldimethyl amine, N-methyl morpholine, N,N-diethyl aniline, N,N,N, N'-tetramethyl methylene diamine, N,N,N, N'-tetramethyl ethylene diamine, pyridine, N- methyl pyrrolidine, triethylene diamine, quinuelidine, and quinuelidine, like): dialkyl ethers (e.g., dimethyl ether, diethyl ether, diisopropyl ether, methylisoamyl ether, dibutyl ether, dihexyl ether and the like); cycloparaffinic monoethers having a six membered ring (e.g., tetrahydropyran--pentamethylene oxide-and ring alkylated derivatives thereof): and cycloparaffinic diethers having a five or six membered ring (e.g., 1,4- dioxane, 1,3-dioxolane, 2-methyl-2-ethyl-1,3- dioxolane; and the like); and other similar substances which tend not to be excessively cleaved in the reaction, such as dicyclohexyl ether, dibenzyl ether, and the like.

The relative proportions of the reactants and reaction diluents do not appear to be critical as long as there is present a sufficient amount of each reactant to participate in the reaction.

In conducting the process for forming the cyclic organoaluminum compounds of this invention, elevated temperatures are employed. Generally, temperatures within the range of about 100C. to about 180C, will be found satisfactory, temperatures within the range of about 130 to about 150C. being preferred.

Ordinarily the reaction will be conducted at atmoposure of the reaction system to air should be kept at a minimum.

The period of time during which the reactants interact with each other is susceptible to considerable variation and is generally discretionary. ln general, the higher the reaction temperature, the shorter the reac tion or contact time.

The procedures of above Examples VlIl-X, inclusive, gave rise to the production of novel compounds, one a cyclic ether and the remainder a group of alkenols. All

of these compounds have special fragrance characteristics and thus are of utility as perfumes, especially in connection with household detergents, shampoos, toilet bars and the like. The alkenols are of particular utility as chemical intermediates inasmuch as they have an olefinic double bond near one end of the modecule and a hydroxyl group at or near the other end. Thus either or both of these reaction sites may be utilized in chemical synthesis. In the case of the chlorinated alkenols, each chlorine atom present provides still another focal point of chemical reactivity. The cyclic ether is also suitable for use as a solvent. Other utilities for these compounds include their use as germicides, insecticides, fungicides, insect repellants, monomers, and surface active agents.

We claim:

1. A secondary alkenol selected from the group consisting of:

6,6-dimethyl-7-octen-2-ol 6,7-dimethyl-7-octen-2-ol.

2. A composition according to claim 1 wherein said compound is 6,6-dimethyl-7-octen-2-ol.

3. A composition according to claim 1 wherein said compound is 6,7-dimethyl-7-octen-2-ol.

Page 1 of 2 1 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTMN Patent No. 3, ,5 Dated June 97 Invent0 Gottfried J. Brendel and Lawrenoe H. Shepherd, Jr,

- It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

- Title page, Item 57, line 18, "--4--penten-l-0l should read L-penten-l-ol. Column 1, line 'r, 5,692, 547" should read 3,692., 5%? line 15, ethes" should read ether lines-l8-22, the formulais incorrect and should read Column 1, line 38, "alkenola" should read alkenols lines 63-65 in the formula) "CH CH should read Column 2, line 7 "in". should read is line 15 in the formula, "C C should read C=--C line 37 g in the formula, C-C should read C=C line #8 k in the formula, "C-C" should read C=C Column 5, line 53, "C should read C Column 5, line 37, "(1,23 moles)" should read (1.23 moles) --5 line 42, "C6" should read C --5 line 46, "cia--methylpentene--2 should read LIT cis-methylpentene-Q; line 47, "C6" should read C6 Page '2 of 2' Po-wso UNITED STATES PATENT OFFICE W CERTIFICATE or CORREC'HN Patent No. 3, 5 Dated June 2 8 197 i lnventofls) Gottfried J. Brendel and Lawrence H. Shepherd, J1-

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 5, line 56, "trans-'5- methylpentene-5" should read M transJ-methylpentene lines 65-68, the formula is incorrect and should read CH D CH D Column 6, line 6 in the formula) "C H should 7 read C H a 1- 1 .1w 1 f the formula) "0H should read CH -i line #9, "H61 Excess" should read M HCl. Excess Column 9, line 23, "quinuelidine," should read quinuclidine, ---5 line 24, "and quinuclidine, like)':" should read and the like) Column 10, line 26, "modecule" should read molecule Signed and sealed this 24th day of December 1974,

(SEAL) Attest:

IFCCOY GIBSON JR. C. MARSHALL DANN attesting Off cer Commissioner of Patents ll. ml 

2. A composition according to claim 1 wherein said compound is 6,6-dimethyl-7-octen-2-ol.
 3. A composition according to claim 1 wherein said compound is 6,7-dimethyl-7-octen-2-ol. 